oP Wireless Air User Guide REPLACING BATTERY IN THE WIRELESS CONTROLLER 1. To install or replace the CR123A battery in the wireless controller, remove the battery cover {from the back of the wireless controller. 2. Remove the battery by sliding the battery toward the spring with one hand and lifting the battery out with the other hand. 3. Insert the battery with the negative side toward the spring in the wireless controller. Take notch of the and symbols on the circuit board. 4. Replace the battery cover.